package com.cris.Controller;


import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

//文件上传和下载
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){//参数名和前端定义一致
        //file 是个临时，需要转存到指定位置，否则本次请求完成后临时文件将被删除
        log.info(file.toString());

        String originaFilename = file.getOriginalFilename();
        String suffix = originaFilename.substring(originaFilename.lastIndexOf("."));
        String filename = UUID.randomUUID().toString() + suffix;
        File dir = new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(filename);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        File file = new File(basePath + name);
        try {
            FileInputStream fileInputStream = new FileInputStream(file);
            byte[] bytes = new byte[1024];
            int len;
            response.setContentType("imag/jpeg");
            ServletOutputStream outputStream = response.getOutputStream();
            while((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
